CN105071363A - SPD backup protector - Google Patents
SPD backup protector Download PDFInfo
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- CN105071363A CN105071363A CN201510499080.4A CN201510499080A CN105071363A CN 105071363 A CN105071363 A CN 105071363A CN 201510499080 A CN201510499080 A CN 201510499080A CN 105071363 A CN105071363 A CN 105071363A
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Abstract
The invention discloses an SPD backup protector comprising a lightning discharge circuit which is used for discharging lightning current when high lightning current exists in the circuit, and a power frequency trigger circuit which cuts off power frequency current when power frequency current occurs in the circuit. The lightning discharge circuit is connected in parallel with the power frequency trigger circuit and then connected in series with a breaking switch controlled by the power frequency trigger circuit. The SPD backup protector is simple in structure and convenient to operate, and the conduction circuit can be automatically selected according to the current type so that safe discharging of lightning current through a SPD can be guaranteed. Meanwhile, fire of the SPD can be prevented, and the fully subsequent protection effect on the SPD can be realized. The SPD backup protector is suitable for subsequent protection of any SPD protection equipment.
Description
Technical field
The invention belongs to circuit protection field, relate to a kind of lightning protection equipment of equipment, specifically a kind of SPD backup protection device.
Background technology
Along with the high speed development of national economy and the raising of modernization level, SPD protection is widely used in the industry-by-industries such as post and telecommunications, electric power, railway, airport, petrochemical industry, work China Democratic National Construction Association, for power consumption equipment provides good lightning protection.But along with a large amount of uses of SPD, SPD fire incident and lightning protection failure accidents increasing, cause very large economic loss to country and enterprise.
SPD fire incident is generally make power current flow into SPD and causing by power supply transien overvoltage fault, and lightning protection failure accidents then great majority is that SPD has departed from protection circuit and causes.Fire incident or lightning protection failure accidents is there is in order to prevent SPD; need for power supply SPD installs standby overcurrent protective device; when there is metallic short circuit fault in SPD; circuit can be cut off rapidly; avoid protection switch to occur bypassing the immediate leadership de-lip reflex and cause the wide-area power outage of power-supply system, can prevent power-supply system from occurring electric voltage exception raises causes SPD to start flowing into power current and phenomenon on fire occurs simultaneously.
At present, both at home and abroad for SPD standby fuse that overcurrent protection uses or circuit breaker, the selecting properly of these two kinds of devices can excise SPD metallic short circuit fault.But when above-mentioned two kinds of protective device quick-break values are selected bigger than normal, power-supply system is once break down (such as voltage raises and causes SPD to start inflow power current), due to the effect of earth resistance and SPD conducting resistance, source current does not often reach protective device quick-break value and causes SPD catching fire; And when two kinds of protective device quick-break values are selected less than normal, be to meet above-mentioned protection, but lightning protection can be caused to lose efficacy because lightning impulse current causes quick-break.
At present, carry out flameproof protection both at home and abroad, bring great convenience, but MCB belongs to panel switches to the monitoring of SPD the mostly supporting MCB of having of SPD, overcurrent protection characteristic and SPD can not cooperation, show as the following aspects:
(1) main task of MCB transports normal duty electric current, exceedes normal current and thread off according to A, B, C, D inverse-time curve, lightning impulse current by wink motor magnet and electric power make MCB false tripping, equipment loses lightning protection.And if in order to increase impulse current of not threading off, people often select C or D curve (as C16 specification can not move dropout wink at below 90A, C32 specification can not be moved at below 150A and thread off in wink), but under this electric current, SPD is catching fire.
(2) MCB needs due to distribution; current trend structure side overweights normal power supply and overload is threaded off; conductive component current trend is through bimetal leaf, electromagnet, moving contact wall, soft copper litzendraht wire one curved way; inductance deal is large; the residual voltage that lightning current produces in this section of path is higher; electrodynamics design is not suitable as the backup protection of SPD; when the lightning current of tens kilo-amperes passes through; between electromagnetic field, soft copper litzendraht wire can be broken by the destruction of repulsion (electric power), and then makes circuit lose SPD protection.
(3) MCB short circuit breaking capacity only has 6-10 kilo-ampere, and when the lightning current of tens kilo-amperes is by contact, contact separates rapidly by electric repulsion, and lightning current closes rapidly again after declining; And the arc current of tens kilo-amperes that contact is formed when separating, beyond MCB arc extinguishing ability bottom line, dynamic/static contact galvanic corrosion is melted rapidly and is damaged by the electric arc that can not get extinguishing, and causes and loses ducting capacity or loose contact and make circuit lose SPD protection.
Therefore, be badly in need of a kind of technology of SPD being carried out to follow-up protection, to make SPD to realize lightning protection, SPD catching fire can be avoided again.
Summary of the invention
Object of the present invention, is to provide a kind of SPD backup protection device, is provided with two-way protective circuit, when electrical grid failure, protective circuit automatically can be selected to release process to electric current, ensure the safe and effective operation of SPD.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is:
A kind of SPD backup protection device, it comprises:
The thunder and lightning leadage circuit of releasing when there is thunder amplification current in circuit, to lightning current, and the power frequency circuits for triggering when there is power current in circuit, to power current cut-out, after described thunder and lightning leadage circuit is in parallel with power frequency circuits for triggering, the section breaker controlled with power frequency circuits for triggering is connected.
Restriction as to thunder and lightning leadage circuit: described thunder and lightning leadage circuit is ceramic gas discharge tube.
Restriction as to power frequency circuits for triggering: described power frequency circuits for triggering comprise triggering solenoid mechanism, also be included in the link gear triggering solenoid mechanism and control lower action and then make section breaker sound contact separation and disconnect, the power reception end of described link gear is connected with the clutch end triggering solenoid mechanism, and the motion end of link gear controls the folding of section breaker.
Author is the further restriction to power frequency circuits for triggering: described triggering solenoid mechanism comprises solenoid, moving armature, static gag bit, described static gag bit is fixedly installed on solenoid, and described moving armature is connected with the free end of link gear through after static gag bit.
Further restriction as to power frequency circuits for triggering: described link gear is tripping mechanism, and the power intake of described tripping mechanism is connected with moving armature, its clutch end control connection section breaker.
Owing to have employed above-mentioned technical scheme, compared with prior art, acquired technological progress is in the present invention:
(1) the present invention is provided with the thunder and lightning leadage circuit and power frequency circuits for triggering that are in series, therefore, it is possible to automatically according to the type gating circuit of electric current, namely be thunderstorm hour when what occur in circuit, thunder and lightning is released by automatic selection thunder and lightning leadage circuit, prevent circuit from breaking down, even if SPD is when releasing 8/20 μ s or 10/350 μ s surge current, the present invention is continuous and effective also, and mistrip phenomenon can not occur; And when occur in circuit be power current time, can automatically select power frequency circuits for triggering be disconnected by section breaker, prevent SPD proterctive equipment from occurring fire;
(2) thunder and lightning leadage circuit of the present invention adopts ceramic gas discharge tube, its induction reactance is little, and power frequency circuits for triggering adopt triggering solenoid mechanism, and its induction reactance is large, therefore dissimilar electric current can select thunder and lightning leadage circuit and power frequency circuits for triggering automatically, reaches object of the present invention;
(3) power frequency circuits for triggering of the present invention adopt solenoid mechanism and link gear interoperation, structure is simple, the accurate disconnection to section breaker can be realized, simultaneously link gear adopts small area analysis electromagnetic trip technical method, solve when SPD occur deterioration or power supply occur abnormal cause power frequency continued flow reach SPD boundary value 5A on fire before the problem that trips of quick-break;
(4) the dynamic and static contact system of section breaker 6 of the present invention have employed flat interface construction, reduces contact resistance, increases through-current capacity, and prevent SPD when releasing surge current, surge current flows through dynamic/static contact contact point, and ablation dynamic/static contact;
(5) power frequency circuits for triggering of the present invention adopt low inductance, low Pulse Design technical method, and reduce device bleed-off circuit residual voltage to greatest extent, residual voltage value is equal to fuse, prevent equipment from suffering overvoltage to greatest extent and situation about damaging occurs.
In sum, structure of the present invention is simple, easy to operate, automatically can select the circuit of circulation according to current type, ensures that SPD is to the safety relief of lightning current, prevents SPD on fire simultaneously, fully for SPD plays the effect of follow-up protection.
The present invention is applicable to carry out follow-up protection to any SPD proterctive equipment.
The present invention is described in further detail below in conjunction with Figure of description and specific embodiment.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the embodiment of the present invention;
Fig. 2 is the concrete structure schematic diagram of the embodiment of the present invention.
In figure: 1-ceramic gas discharge tube, 2-solenoid, 3-moving armature, 4-static gag bit, the 51-the first gangbar, the 52-the second gangbar, 6-section breaker, 61-section breaker fixed contact, 62-section breaker moving contact, 7-spring.
Embodiment
embodimenta kind of SPD backup protection device
The present embodiment is a kind of SPD backup protection device, and it comprises:
The thunder and lightning leadage circuit of releasing when there is thunder amplification current in circuit, to lightning current, and the power frequency circuits for triggering when there is power current in circuit, to power current cut-out, after described thunder and lightning leadage circuit is in parallel with power frequency circuits for triggering, the section breaker 6 controlled with power frequency circuits for triggering is connected.
The leadage circuit of thunder and lightning described in the present embodiment adopts ceramic gas discharge tube 1 of the prior art, as shown in Figure 1 and Figure 2.
And power frequency circuits for triggering in the present embodiment as shown in Figure 2, comprise triggering solenoid mechanism, also be included in the link gear triggering solenoid mechanism and control lower action and then make section breaker sound contact separation and disconnect, wherein trigger solenoid mechanism and comprise solenoid 2, moving armature 3, static gag bit 4, described static gag bit 4 is fixedly installed on solenoid 2, and described moving armature 3 is connected with the free end of link gear through after static gag bit 4.
And the link gear in the present embodiment adopts tripping mechanism of the prior art, as shown in Figure 2, comprise the first gangbar 51 and the second gangbar 52, the tail end place of moving armature 3 is located in the power intake gap of described first gangbar 51, the clutch end of the first gangbar 51 is provided with a crotch, and the structure of the second gangbar 52 is substantially identical with the structure of the first gangbar 51, difference is that the second gangbar 52 arranges one end of crotch as power intake, and removably link together with the crotch of the first gangbar 51, one end that second gangbar 52 does not arrange crotch is power intake, the spring 7 being in extended state by one is fixed, and the moving contact 62 of section breaker 6 is fixedly arranged in the second gangbar 52.
The operation principle of the present embodiment is: when producing thunder amplification current in circuit, and because the induction reactance of ceramic gas discharge tube 1 is little, and the induction reactance of solenoid 2 is large, and therefore thunder amplification current can directly be released by ceramic gas discharge tube 1, and when occur in circuit be improper power current time, power frequency electric fails to be convened for lack of a quorum direct electric conduction magnetic coil 2, solenoid 3 makes static gag bit 4 generate an electromagnetic field, and then static gag bit 4 is by moving armature 3 adhesive, and the clutch end of moving armature 3 is connected with tripping mechanism as shown in Figure 2, namely moving armature 3 can be promoted the first gangbar 51 of tripping mechanism after adhesive, and then make the crotch of the first gangbar 51 and the second gangbar 52 mutually depart from, second gangbar 52 is pulled downwardly under the effect of spring 7 stretches, drive the section breaker moving contact 62 of section breaker 6 to move simultaneously, section breaker moving contact 61 is made to be separated with section breaker fixed contact 62, reach the object disconnecting main line.
Claims (5)
1. a SPD backup protection device,
it is characterized in that:comprise the thunder and lightning leadage circuit of releasing when there is thunder amplification current in circuit, to lightning current, and the power frequency circuits for triggering when there is power current in circuit, to power current cut-out, after described thunder and lightning leadage circuit is in parallel with power frequency circuits for triggering, the section breaker controlled with power frequency circuits for triggering is connected.
2. SPD backup protection device according to claim 1,
it is characterized in that:described thunder and lightning leadage circuit is ceramic gas discharge tube.
3. SPD backup protection device according to claim 1 and 2,
it is characterized in that:described power frequency circuits for triggering comprise triggering solenoid mechanism, also be included in the link gear triggering solenoid mechanism and control lower action and then make section breaker sound contact separation and disconnect, the power reception end of described link gear is connected with the clutch end triggering solenoid mechanism, and the motion end of link gear controls the folding of section breaker.
4. SPD backup protection device according to claim 3,
it is characterized in that:described triggering solenoid mechanism comprises solenoid, moving armature, static gag bit, and described solenoid is fastened and is arranged on static gag bit, and described moving armature is connected with the free end of link gear through after static gag bit.
5. SPD backup protection device according to claim 4,
it is characterized in that:described link gear is tripping mechanism, and the power intake of described tripping mechanism is connected with moving armature, its clutch end control connection section breaker.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510499080.4A CN105071363A (en) | 2015-08-14 | 2015-08-14 | SPD backup protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510499080.4A CN105071363A (en) | 2015-08-14 | 2015-08-14 | SPD backup protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105071363A true CN105071363A (en) | 2015-11-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510499080.4A Pending CN105071363A (en) | 2015-08-14 | 2015-08-14 | SPD backup protector |
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| CN (1) | CN105071363A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919661A (en) * | 2017-12-28 | 2018-04-17 | 浙江多格电气有限公司 | A kind of modular Surge Protector |
| CN108711836A (en) * | 2018-07-02 | 2018-10-26 | 李红斌 | A kind of switching mode SPD of built-in disconnector |
| CN109599853A (en) * | 2018-11-23 | 2019-04-09 | 上海电力学院 | A kind of SPD back-up protection device and matching process based on GDT and NTC |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5583734A (en) * | 1994-11-10 | 1996-12-10 | Raychem Corporation | Surge arrester with overvoltage sensitive grounding switch |
| CN102184808A (en) * | 2011-05-05 | 2011-09-14 | 厦门大恒科技有限公司 | Electromagnet with current separation channel |
| CN202231303U (en) * | 2011-09-14 | 2012-05-23 | 成都兴业雷安电子有限公司 | Novel pressure-sensitive protection switch |
| CN204391717U (en) * | 2014-11-08 | 2015-06-10 | 孙麓轩 | A kind of Novel electric surge protector |
| CN204928111U (en) * | 2015-08-14 | 2015-12-30 | 深圳康普盾科技股份有限公司 | SPD backup protection ware |
-
2015
- 2015-08-14 CN CN201510499080.4A patent/CN105071363A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5583734A (en) * | 1994-11-10 | 1996-12-10 | Raychem Corporation | Surge arrester with overvoltage sensitive grounding switch |
| CN102184808A (en) * | 2011-05-05 | 2011-09-14 | 厦门大恒科技有限公司 | Electromagnet with current separation channel |
| CN202231303U (en) * | 2011-09-14 | 2012-05-23 | 成都兴业雷安电子有限公司 | Novel pressure-sensitive protection switch |
| CN204391717U (en) * | 2014-11-08 | 2015-06-10 | 孙麓轩 | A kind of Novel electric surge protector |
| CN204928111U (en) * | 2015-08-14 | 2015-12-30 | 深圳康普盾科技股份有限公司 | SPD backup protection ware |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107919661A (en) * | 2017-12-28 | 2018-04-17 | 浙江多格电气有限公司 | A kind of modular Surge Protector |
| CN108711836A (en) * | 2018-07-02 | 2018-10-26 | 李红斌 | A kind of switching mode SPD of built-in disconnector |
| CN109599853A (en) * | 2018-11-23 | 2019-04-09 | 上海电力学院 | A kind of SPD back-up protection device and matching process based on GDT and NTC |
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| C06 | Publication | ||
| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20151118 |
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| RJ01 | Rejection of invention patent application after publication |